provide automated non-attended COA env bootstrap

[gberche-orange]

User Story outline:

• As a COA contributor, in order to run end-to-end automated tests, I need to set up minimum COA prereq environment
• As a paas-template author, in order to contribute templates, I need to set up COA prereq minimum environment
• As a paas-template operator, in order to deploy paas-template, I need to bootstrap COA prereqs

Acceptance scenario:

• Given raw Iaas prereqs (openstack credentials)
• When I launch the COA bootstrap
• Then transient infrastructure (bosh director / concourse / credhub) is set up
• And paas-templates micro-deps deployment subset gets deployed with
  • micro-depls/micro-bosh
  • micro-credhub
  • micro-dns
  • micro-minio
  • concourse-micro
  • gitlab + config

[gberche-orange]

Alternatives for possible implementation:

• BBL with openstack support Feature request: Adding OpenStack as supported IaaS cloudfoundry/bosh-bootloader#77 (comment)
• BUCC https://github.com/starkandwayne/bucc
• https://github.com/alphagov/paas-bootstrap#readme (leveraging vagrant, tested on AWS )

[o-orand]

another alternative: https://github.com/pivotalservices/turbo

[o-orand]

To help investigation, using our current bootstrap server, BUCC and BBL have been set up.

• BBL config is available at ~/bbl, it's using 192.168.90.0/24 network
• BUCC config is available at ~/bucc, it's using 192.168.80.0/24 network

[gberche-orange]

Status during backlog review: on a dedicated COA Iaas tenant, a bootstrap vm instanciated a BUCC vm, which launched a concourse which is running COA ci, with the BUCC bosh director to be used to deploy the reference data set (#108)